Preparation and red long-lasting luminescence properties of Eu3+ doped CaO

Author:

Li Hai-Ling ,Wang Yin-Hai ,Zhang Wan-Xin ,Wang Xian-Sheng ,Zhao Hui ,

Abstract

The red long-persistent phosphor CaO: Eu3+ is prepared by a co-precipitation method with further thermal decomposition. The X-ray diffraction analysis shows that the crystal structure of calcium carbonate sample transforms into a single-phase structure and then generates a single-phase calcium oxide structure with the increase of sintering temperature. The excitation spectrum of CaO: Eu3+ shows a broad band around 255 nm, which is attributed to the charge transfer of Eu3+-O2-, and a sharp peak at 393 nm. The emission spectral limes of sample correspond to Eu3+ transitions between 5D and 7FJ (J=0, 2, 3, 4) electron configurations. The red long afterglow is observed at room temperature. A trap level located at 0.69 eV is found by thermolumihnescence measurement, which arises from the fact that Eu3+ is substituted for Ca2+ and enters into the lattice The afterglow luminescence mechanism of sample was discussed according to quantum tunneling.

Publisher

Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Subject

General Physics and Astronomy

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